Francois van rysselberghe



(N0 Mode'l.) 3

' P.. VAN RYSSELBERGHE.

MEANS FOR PREVENTING INTERFERENCE IN COMBINED TELEGRAPHIO' ANDTELBPHONIG SYSTEMS.

No. 322,333. Patented Julyl l, 1885.

.TeZe pZone line.

J izz/enZor frazwozis IfiWeZZIyZQ N, PETERS. PllOlwUthogrlpMr.Walhingtnn, D. C.

UNITED STATES PATENT OFFICE.

FnAnooIs VAN RYSSELBERGHE, or SCHAERBEEK, BELGIUM.

MEANS FOR PREVENTING INTERFERENCE IN COMBINED TELEGRARHIC AND TELEPHONICSYSTEMS.

SPECIFICATION forming part of Letters Patent No. 322,333, dated July14-, 1885.

Application ,filed June 6, 1885. (No model.) Patented in Germany June 9,1882, No. 22,633 in Belgium November 16, 1883; in France November 18,1883; in England November 23, 1883; in Luxemburg December 8, 1883; inItaly December 31, 1883 in Portugal January 18, 1884 in Canada January24, 1884; in India January 29, 1884; in Sweden February. 12, 1884 inSpain April 23, 1884; in Denmark June 18, 1884; in Brazil July 5, 1884;in Argentine Republic J uly 19, 1884; in Austria September 13, 1884, andin Uruguay December 152, 1884.

To all whom, it may concern:

Be it known that I, FRANgoIs VAN Brs- SELBERGHE, a Belgian subject,residing at Schaerbeek, Belgium, have invented new and usefulImprovementsin Telegraphic and Telephonic Apparatus, (for which I haveobtained the following Letters Patent, viz: Germany, J une 9, 1882, No.22,633; Belgium, November 16, 1888; France, November 16, 1883; GreatBritain, November 23, 1888; Italy, December 31, 1883; Austria, September18,1884; Canada, January 24, 1884; Portugal, January 18, 1884; India,January 29, 1884; Spain, April 23, 1884; Sweden, February 12, 1884;Denmark, June 18,1884; Luxemburg, December 8. 1883; Brazil, July 5,1884; Argentine Republic, July 19, 1884, and Uruguay, December 12,1884,) of which the following is a specification.

This invention relates to an impro ed system or arrangement of devicesfor producing the gradual telegraphic currents required in carrying outmy method of simultaneous telegraphy and telephony, which fornis thesubject-matter of prior patents, and depends upon the removal of theeffects of induction between telegraph and telephone lines by retardingthe rise and fall of the prime telegraphic currents, whereby the sameline wire or wires or the same net-work or system of wires can be usedfor the transmission of telephonic and telegraphic messages, and theeffects of such telegraphic currents are not perceptible in thetelephone-instrument, telegraphic sounds being no longer audible in suchtelephone.

The invention consists in introducing permanently into the circuit of atelegraph system a pair of magnets and a condenser, as will behereinafter described and claimed.

In the drawings, Figure 1 is a diagram view of a telegraph systemprovided with my improved means of retarding the rise and fall of thetelegraphic current, and showing a telephone-wire arranged in theVicinity of the telegraph-wire. Fig. 2 isasimilar view showing the useof the same line-wire for the transmission of telegraphic and telephonicmessages.

The reference-numeral 1 designates the manipulator or transmitting-keyfor opening and closing the circuitof the battery 2, and sending to theline 3, each time the key is closed, a current of the same'polarity, andinterrupting it when opened. The numeral 4 represents a telegraphicreceiving-instrument, the electro-magnet of which must have a resistanceof not less than five hundred ohms.

The above parts constitute the ordinary Morse telegraphic system, andrequire no special description.

For the purpose of graduating the emission andextinction of thecurrents, or reducing the sudden rise and fall of such currents, I placean I electro-magnet, 6, of about five hundred ohms resistance, betweenthe battery and the manipulator, and I introduce a secondelectro-magnet, 7, between the manipulator and the main line, saidmagnet 7 offering the same degree of resistance as the magnet 6. I alsoplace a condenser, 8, of two micro-farads, between the two electromagnets 6 7, one of the faces of said condenser being connected with awire, 9, in derivation of the main line, and the other face beingconnected with the earth by the Wire 10. I

It is evident that when the key of the transmitting-instrument isdepressed the current from the battery passes into the two magnets andthe condenser introduced between them in derivation of the niain line.In this manner the current is caused to pass to the main line in agradual manner, or is retarded in its passage to the main line, since itis evident that the magnets and condenser are first charged and that theinitial strength of the current emitted upon manipulating the key isnever carried to the main line. WVhen the manipulating-key is raised,the connection with the battery is broken and the charge of thecondenser and the magnet introduced into the main line passes to thelatter in the form of a current,whose extinction is as gradual as wasits emission upon the original depression of the transmitting-key.

I have found by experience that the best arrangement of devices forproducing gradual telegraphic currents is the two eleetro-magnets andcondenser arranged between the same,

these parts serving to bring into existence an electro-current whichgradually increases in strength until it reaches its maximum stage, andthen decreases in strength until its extinction. In patents heretoforegranted to me I have broadly claimed the working of telegraph-lines withelectric currents whose emission and extinction is gradual, so as toovercome the eifects of induction and allow wires used solely fortelephonic purposes to be located in the neighborhood oftelegraph-wires; and I have also contrived and patented several systemsof using such gradual currents upon a single wire or wires used for thesimultaneous transmission of telegraphic and telephonic messages.

In Fig. 1 is exemplified the first-mentioned system, and in Fig. 2 isshown the adaptation of a single line-wire for carrying out the sec 011dmethod. In this latter instance the telephone 12 is placed in a derivedor branch line, 13, and is separated from the telegraph line by acondenser, 14, of about one-half micro-farads.

It is evident that the devices herein shown and described serve mosteffectually to produce telegraphic currents which may be compared whenin operation to a gentle wave as cending to the full potential of thecurrent, and descending gradually to the ordinate which represents thezero-point.

The function and mode of using such currents has heretofore been fullydescribed by me, and it need only be incidentally mentioned here thatthe well-known telegraphic rattle in telephones is avoided by their use,since the diaphragm is only slightly bent and not allowed to vibrate.

What I claim is In a system for the transmission of telegraphic andtelephonic messages over adjacent wires or the same line wire or wires,the combination, with the manipulator at each transmitting-station, oftwo electro-magnets arranged, respectively, between the battery andline, and a condenser placed between the two electro-magnets inderivation on the line, substantially as described.

In testimony whereof I aiiix my signature in presence of two witnesses.

FRANQOIS VAN RYSSELBERGHE.

WVitnesses:

A. M. TANNER, J. A. RUTHERFORD.

